Tamron has announced the development of its first Z-mount system lens, the 70-300mm f/4.5-6.3 Di III RXD, which it claims as the thinnest and lightest telephoto zoom for full-frame mirrorless cameras.

The lens looks to be identical to the Sony E-mount 70-300mm f/4.5-6.3 Di III RXD, which was released in 2020, and shares many, if not all, of the design decisions found in that lens, including promises of being the thinnest and lightest telephoto zoom for full-frame cameras. The optical design is the same for the Z-mount model, which consists of 15 elements in 10 groups, 10 of which are low-dispersion elements for reducing aberrations and Tamron’s BBAR coating for reducing reflections.

Tamron’s Rapid eXtra-silent stepping Drive (RXD), which the firm claims offers extremely quick and accurate autofocus and enables users to keep pin-point focus on continuously moving subjects—often captured with telephoto zoom lenses—powers the lens’s autofocus.

The lens weighs 20.5 ounces, measures 5.9 inches long, has a maximum diameter of 77 millimeters, and is specifically made for mirrorless cameras. According to Tamron, the small size and light weight are perfect for traveling and make sports, portrait, and casual photography as well as landscape and nature photography simple to reach.

No particular release date is given, but Tamron expects the 70-300mm F4.5-6.3 Di III RXD lens for Nikon Z-mount camera systems to ship this fall. For comparison, the MSRP for the E-mount variant at launch was $549.

More info on Tamron’s website.